1 files changed, 56 insertions, 0 deletions
diff --git a/src/cipher/tea/tea.cpp b/src/cipher/tea/tea.cpp
new file mode 100644
index 000000000..c5bd1b1fa
--- /dev/null
+++ b/src/cipher/tea/tea.cpp
@@ -0,0 +1,56 @@
+/*************************************************
+* TEA Source File                                *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#include <botan/tea.h>
+#include <botan/loadstor.h>
+
+namespace Botan {
+
+/*************************************************
+* TEA Encryption                                 *
+*************************************************/
+void TEA::enc(const byte in[], byte out[]) const
+   {
+   u32bit L = load_be<u32bit>(in, 0), R = load_be<u32bit>(in, 1);
+
+   u32bit S = 0;
+   for(u32bit j = 0; j != 32; ++j)
+      {
+      S += 0x9E3779B9;
+      L += ((R << 4) + K[0]) ^ (R + S) ^ ((R >> 5) + K[1]);
+      R += ((L << 4) + K[2]) ^ (L + S) ^ ((L >> 5) + K[3]);
+      }
+
+   store_be(out, L, R);
+   }
+
+/*************************************************
+* TEA Decryption                                 *
+*************************************************/
+void TEA::dec(const byte in[], byte out[]) const
+   {
+   u32bit L = load_be<u32bit>(in, 0), R = load_be<u32bit>(in, 1);
+
+   u32bit S = 0xC6EF3720;
+   for(u32bit j = 0; j != 32; ++j)
+      {
+      R -= ((L << 4) + K[2]) ^ (L + S) ^ ((L >> 5) + K[3]);
+      L -= ((R << 4) + K[0]) ^ (R + S) ^ ((R >> 5) + K[1]);
+      S -= 0x9E3779B9;
+      }
+
+   store_be(out, L, R);
+   }
+
+/*************************************************
+* TEA Key Schedule                               *
+*************************************************/
+void TEA::key(const byte key[], u32bit)
+   {
+   for(u32bit j = 0; j != 4; ++j)
+      K[j] = load_be<u32bit>(key, j);
+   }
+
+}